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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472a9589d4fcc7e3ee54fb25a81b9806aa524e805e8a1a212b2873134f2ee361' 
  AND token = 'jgmsRD7cTKUSCMNRO+nImIcgvl6Rc791BdEHh8evVio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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