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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9052807bd1bd6527547b8eb87585157eb1ffaf1d56690580233f0d933f44ef9f' 
  AND token = 'JQlp171wG6cO8Ui5mo4aLogP0zkR/xk8pT3lY/NFhls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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