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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc16a0464c7e9b0e157dfe71d7190140b8f04c5a73d7e799115bc38eb3b71b54' 
  AND token = '1Lck0aD7AjIUTGqB40F4PX4XjWsrOrxfQRC4+dHlctU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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