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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70559b95ad6a8668dd486ff1bf54c6a5f8727d010eaa0cec954d38b81ad1dbe4' 
  AND token = 'sVim9YPXVbrn6vgalYza2bOm94Pf/zt+pITg4hI+IyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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