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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59b593d8e99cf550d38567d2afac943824ae87ed348772eb4ed97f70963f4f8' 
  AND token = 'KKb6xvoD6aTWIeNMe8wp1gHmCdo8VhwvSxOyHLiOnA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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