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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5653f64fcf094047f19e3711db6abee60c1b76f00c108ec02c65e5caa2a5cae0' 
  AND token = '9bCSs1ljMCI9QRnuPhhSdHdae02+jukOdx7PPW8W0hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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