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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9dc48dfd15a6374e444d5238741554fd23e707d7dd5591165ca2d59093e1172' 
  AND token = 'Iah2SGOX/+u0uJ2BHdSBAWX9gN8Hc4rLJ74kQeaqwX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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