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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fce13fded2ea4d5a3e5d1e05160b1790503602791881b3c7df68dfecf081a92' 
  AND token = 'wIEzgcjwsPcgDiBl7vcelpfRPN7cTXCxic3afAhbQJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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