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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88010c4ec09714c7a47ddb12201559a4c402cd7d11fbf887fa83ea5373593c3b' 
  AND token = '/lbu6SApZCOJ3WrKFoeY7LfJAaTZi1kWGsmgR0ia7wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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