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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0003f965c853cd747874d34de6a5d42e45037bb68a48278fa7ff65d10d528328' 
  AND token = 'ow3JjcXc/3m0vw+lZKLNvgRdEb5Oiy5EMey80vXHV68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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