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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593e372554db746173e2f03ecb02a693c8917705e9c494e61bf25cc1ab34caa8' 
  AND token = 'fz3mn6P1GkusnO+CTgqFI8AJaCJJ0RV8NIB6JhWr8JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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