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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19177e52073ba56e5c0f2f81f45f6fe6a89aa4b0a18f8a2d4db46f492d8672c0' 
  AND token = 'DaSvPQ57AheA84SZuirY9rU2fHUYT7x6ZlaMEgogeb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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