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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad54eb112b961edb0e3986971e5c5e2cfb0be64d0a0a9d18b5106d00c8ccbac' 
  AND token = 'hbLbMpF0U1FC5IjzFMI1T3hR3i18VSYc6v0vocOgw7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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