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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ab949f10d201e8fc19ce7cfc2e9502a748891764f7fdc79f612280f86ea194' 
  AND token = 'vQHbUGjb+O8gxeR5t0ORCXPyZEWp7hSG9jzuAWrM8UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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