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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbaea83b4560b86ee3dd3765bbad83383a85495df0381488b1e6518ae59a7749' 
  AND token = '1XiBo3Zecrf91kZ/OpXW21Kz2tTEQ1hUkXgDRhJlPTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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