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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0942cb57182ac8920b92d193c16bf60f0356d60a42c4f8c3fc907ed96444f166' 
  AND token = 'Vq0fv1VXbDWu0GcCnlXkycQ9L2DbkJ0HHrG8vNJ59sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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