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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb5a2d9979a5d80e8f3b66443ec92ee569ee64be40c974bf33125393eced57b' 
  AND token = 'T1zlmlAHM/D6t9L5DsXpHP+Tl9oUNKI/1BuN4w7mUGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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