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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31411395eb89d15272ccd015e67f1d1a04d8ba7ce875bb05f0bd842f50243550' 
  AND token = '/h4Muq4AHLdhYRJWoKRrnDy6xjLSbwG6hliZa7YAY08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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