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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15df3e13c78d8a0c03565482c9dfee91c472490e077deb81f6c717f9bf90b14c' 
  AND token = 'lt9NofnoZn5+PUB5HT1CQ4KMeieime53rwnGBSpgh2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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