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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d22d57fd46784f526bd173c79aa228733201d01a12abd750048ca6ba2b4d45' 
  AND token = 'Riw+KGmVJha/oJ2Klx+Ecl/39HEuOXCn4aFN7ApwWfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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