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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2c4f503aeeadfbf1bc25c6a6903ce09a6748204f27d8df6a2882a66b5737a2' 
  AND token = '0p4Za7mNATvtbevaNRg72Hq8vhOu5/fm/yQXrA4sIcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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