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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9241e8703699df5ed5a4feea6c798dcc7878ebfc1d907d5567cee286a163acfb' 
  AND token = 'kcdUHI5wG1zZpBk4vsNmDAcId9RgmpyZOYRVgt0l3ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}