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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71946fdaf09693688e3c49e99d55ddfe9940cf77feb080ae93d2579c223af961' 
  AND token = '2lBf5s4lqPCYA3rAkezaG+bpnWX79sfwsvtvr1xEy0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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