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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca6b7b324d0222709ce962befbb8dbcc711e02f1cf67015cb3d9243895105f4' 
  AND token = 'blk0JR0VSfKuBzhC7tFLqqZ7NGNaM0LuZ+1o2+kpRkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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