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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8146627ec3b2694d99f021f09bee6748e1484db5e703d8a7639ef0c62aba518' 
  AND token = 'jfNmMlE3KHmiqA46Mk2SHaf+9xs/M2sfty2QpNlBXV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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