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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddfc7def9eb3a8f3438fc9c760c40b7acd348e7848a6f321251d6d532e75965d' 
  AND token = 'CSm3IZhWE7gxQJfxkpKPEYJeRbo2JHVoHbVeZzuO2x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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