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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9062098e98f7cc27f646ec96d01f643a60213b02166450236c43b7b550e3e8ae' 
  AND token = 'kfxcf4AkjHhOkBnPB2kTFeIREpM7hrOW0pQuEO50k68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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