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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f264d34bc9646eeb240f058155007f03d7638e94faaaab86808d620d4a01803' 
  AND token = 'K3E+jZoYPTqyQ3FQBwz67ADfHsI6K8DfOeujeTuYZgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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