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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '924e5a4b1482fc21cb17fecf01cb6c11203f3c349ff3475df5ad45f5a6322db2' 
  AND token = 'Dp8+qDxrAgp02K+4y1vzgmoAPoKhp/icrD44+hHToro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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