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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2edfc076f14576f182863acab9ab1543ddbbef844858df8c1e3d61336e0673' 
  AND token = 'ScMm0//EsMFop83aXl7bkz7n/eBQ+Kne8wcOpo2wj9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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