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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f25f0e8ae6a4a65b0d4121f2695014d25ddd430a7a6dc4aef9128c2730cd465' 
  AND token = '5TK4G/JXJ7Q3qcf5ETbyppjSmvyC51JeqyOGX/43ZLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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