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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c542c5039e18245a840f03a198be24e8d82190612a14ce7ec456d2296f523c7' 
  AND token = 'naO+Q/sSqHG3xl3N3TkG2m9sKniCLfyqIK7DNkxdikE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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