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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb769c183a327cfa3be484097e6097f25c582f4085b35f94b2f9a63de206e3b' 
  AND token = 'EzN72ZMvE22+n2QDPuqTztdORPKWY58fF63t5xGbZpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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