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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb73c63c3e85941b5f4fa895b170bc0296c6922dfb6370b9586560ddd612d6b2' 
  AND token = 'APlH75oFowSPwdOYKWt5lxlTyaznLm54wqj3Bt1QBGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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