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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aed9522bd23e25554ea29f037707817dc1e0f5254fccae7745faf02c0c89722' 
  AND token = 'wAaHgr1R5dQzb1gIfLwfRhOJUI7c/pX4T8d2VQJLqOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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