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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcdfb45ac6c3d98d94de50cffd5c83826e9453621eab60629ca4b57d63c42403' 
  AND token = '0AZWoH0LD6GUlkIYwjvH9EInk5FYnpJc6WwKWbnrAqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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