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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43c39619dcf1a07713d3c2beb75084955d4f796018fff0986a1c9b4b749cc472' 
  AND token = 'kvX0Eh1IEUNDvQZRiDyupixsreMnGL/OoX8K8ph2KFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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