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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309672aee50899fcf29b2f981bb5db82592350b772a352a57c0847a60bd67d0c' 
  AND token = 'pDF8AHgZGrMYLeEyo1IRhbEsTbJ9l843q6QliJMkiBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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