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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84533fbc25cd19b560ccd3a7ce8e4bf1795b17ac2ddd6ca95d11f3a700cf729' 
  AND token = 'SAzNngNMqLyJ9oksznp7sBLYc1Y0VwM1cktcC+mh3vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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