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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7f4a5f9ab909a85ee02571f0ba2a35a6359f182a37f7aeffab5a240f97df69' 
  AND token = 'dkuaFgQlncZGg4GDB8GHXViHgdihtFd+yAHbH6Dx8cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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