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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89fb7a8122adb4bfd60d3027f56ab51312f548ee81b4d4b43ad30798e834eda' 
  AND token = '4uimOx8pYLN3mbYVulizJviuRRwNU/3rWTUanq8Ic1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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