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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e92555644ce60d5618c45d7fb6cb85b262a5101f8bb1d4b32a15fefae21cbc' 
  AND token = '7vviNPTp622T5HFrMJwu07B6TSstoNmPVePc+ilq91E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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