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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7605fb5e55ccc24f2245ecfab988dc548596d58bae42eb9165d0a6808795ba' 
  AND token = 'ddp4q21v5i8e8XcViZYFAYO0vDtSxLRo6+5GpCwfvFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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