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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43babf20f2f8b01c6f0abb68797eee3a8c0eac39b228f9ebc717dab706ee198' 
  AND token = 'dWPSoyRS5Lwi+DeTQNEcRldmKuVJ3XUn7sEHd8J6l60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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