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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd57b36b3f1e1349ab95b5a631e398090bf5fe85d5a331a7e8f8f473d431eb48' 
  AND token = 'avQdTf4aZQRkju9IOiplxfzG3zjaVEDf+X+8CZa5cZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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