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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7af0ae3f006ada8ab894cb41d0ec9b0afca4a150e232f6081af10aa2c67980' 
  AND token = 'cvkOmtk1ZV8Boroo8sQUelAm3c4tw58cHR6HLSC5CoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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