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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf79d74e4648ba8dc32a4107538069c485bd65e0a5eb856a276c25ec9315cc86' 
  AND token = 'BTaADOuYwrVxRyfe5xRXHyxL5HcwN9TTEZcrPwGock4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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