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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bbfa726ecef00d90d29f35589a2cd37b0cf5d1c414179a77aae2a75eb4ec907' 
  AND token = '6pr0qdtaqXT+neBOXZto/issKkEvwgtKD5bF/jUXwow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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