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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72ff64271183fc27e55c9e5aa894b5006152df26ce1f45861cd259df9ac56d9' 
  AND token = 'jrebbIY+JdHjpnSOQ27fflf2xrBlOENGGWr0ylKFU6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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