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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2559324771150ec836e7a659740f93428b562ad8dc5a46ce1e23c3f9aa9197a5' 
  AND token = '2oyDZnkpWmhb7h55I5vRkSo9FMORYLmBfol+RRM67k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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