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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd94dd28d25f2e0f723ba7058bf6575044c85cdf6248eee40e83e6dfb873d9da' 
  AND token = 'M/JkncHv7PbU/zrMSTkPx6zRqg45R26gMFUbe7ZPKyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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