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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae2c61b12f1875b88116fa30ee03fdbc94ccd0bfb7e3d573f7c1b70253a9559' 
  AND token = 'uwvZqLgNNkw4ZA6e9Mq6CTOnpZ2SLxeIWbB661V0OYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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