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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88f2be3967618b4a82375e48d6eb6ea8d3b8caa865cc793c663a30010517bfb' 
  AND token = 'mCi2xfYopXPgFAd2ZL9rtVeNVCBLszUX3Ji8MoMssug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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