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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ef2cec541cfc7b1372573831d55b019a114b295b93adeeeef7ee2f6c8eac2e' 
  AND token = 'dw0HDenhyGUT1kuB1CLHvWpVlObKeXrxMTyrBsQjB5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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