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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb02160f269d87eab5576a09a5519db9f39e8c4184861f33fc7da5322a8ea46' 
  AND token = 'FV+B5EAHFNPgsz1E4vyYi9NRv2ltyfH9jM546lRs1h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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