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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb94c867f0a90d900e90557ed03435761916e69d2e295cfee6d6e3b785254fa5' 
  AND token = 'PiThHwox5j572fqZi8Fp/649kQaJFZfdBd7GzI30sB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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