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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126b11312d63b1fefaea3063d521fc033ac6e0b8b84665c12dc802e5a76e8fba' 
  AND token = 'h/EeXo98wvAfZNCwOkVuHdxyCjHxERZ1x9HD12mCbYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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