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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2787bed553fba31c7e5966f63ffde6a99912c583c8e08e9456d511949abbb83' 
  AND token = '/lT7Ashk+3FrGY6I0RUIkAyujrza1JiGwWGlCW7brKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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