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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b78b3e8a0756828220772f8ed2c93658be5246d57e4357223338510053c8c00' 
  AND token = '1dpgTA1GYENEnlJSvp3y8RMi7gGkNd09vz1WiEIfvq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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