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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e8c7b1c8851b286eecb8f4331f513745d9d2e64e8199f7e4f3e6310328fd5f' 
  AND token = 'wXgx/6GpQGLEDEKaTC5e5vUvCEPx93zE6s6sMbBzfho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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