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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e3b413e3de2cf14c8bf287e4e07fe2e675e47b5355d9e7bf69efe947de02f1' 
  AND token = 'wnSQI53hix1YUKjmkYW0WwFE3GG1odwdo1UU884QIJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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